diff --git a/cli/src/helpers/setImportAlias.ts b/cli/src/helpers/setImportAlias.ts
index a1b2fc4e5e..cff762e6c7 100644
--- a/cli/src/helpers/setImportAlias.ts
+++ b/cli/src/helpers/setImportAlias.ts
@@ -21,6 +21,8 @@ function replaceTextInFiles(
 }
 
 export const setImportAlias = (projectDir: string, importAlias: string) => {
+  if (typeof importAlias !== "string") return;
+
   const normalizedImportAlias = importAlias
     .replace(/\*/g, "") // remove any wildcards (~/* -> ~/)
     .replace(/[^/]$/, "$&/"); // ensure trailing slash (@ -> ~/)
diff --git a/cli/src/index.ts b/cli/src/index.ts
index 47dce51954..20e9fa7c90 100644
--- a/cli/src/index.ts
+++ b/cli/src/index.ts
@@ -78,7 +78,7 @@ const main = async () => {
   });
 
   // update import alias in any generated files if not using the default
-  if (importAlias !== "~/") {
+  if (typeof importAlias === "string" && importAlias !== "~/") {
     setImportAlias(projectDir, importAlias);
   }